Question

In Fig. 8-27, a frictionless
roller coaster car of mass m = 809 kg tops the first hill with
speed v0 = 12.1 m/s at height h = 37.2 m. How much work does the
gravitational force do on the car from that point to (a) point A,
(b) point B, and (c) point C? If the gravitational potential energy
of the car-Earth system is taken to be zero at C, what is its value
when the car is at (d)B and (e)A?